Best AstraChat Alternatives (2020)

Slack

A messaging app for teams who see through the Earth!
Mattermost

Mattermost is an open source alternative to Slack.
Telegram

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Zulip

Powerful open source group chat
WhatsApp

WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.

free
Jitsi

Open-source video calling and chat platform.
✓ Brosix

Brosix will improve the efficiency and decrease the expenses of your business by providing you all-in-one features package and many control functions.

freemium $4.0 / Annually (Private Team Network, Full Control over user accounts)
Cisco Jabber

Cisco Jabber lets you access presence, instant messaging (IM), voice, video, voice messaging, desktop sharing, and conferencing.
Pidgin

Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.
Discord

Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Contus Fly

Contus Fly, an instant messaging solution for real-time mobile chat app development. Build 100% customizable mobile chat . be reachable at any given time.
Trillian

Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.